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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>建设中...</title>
    <style>
        .text-center{text-align: center;}
        .p-4{padding:4rem;}
        html,body{
            background-color: rgb(252, 253, 252);
        }
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<body >
    <div class="text-center">
        <h1>建设中...</h1>
        <video src="./video.mp4" autoplay loop muted />
    </div>
</body>
</html>